WASHINGTON, May 18 /PRNewswire-USNewswire/ -- Every nine and a half minutes someone in the United States is infected with HIV. The Centers for Disease Control and Prevention (CDC) estimates that approximately 56,300 individuals became infected with HIV in 2006 alone.

Human testing of an AIDS vaccine is moving into its second phase in China, researchers said Saturday.
Chinese scientists said they intend to enroll 30 more volunteers for the next round of tests, Xinhua reported.

A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.